ios nstimezone?nsinteger?iOS error Initializing NSTimeInterv

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I'm trying to get the time interval between two NSDates, namely previousActivity.stopTimeand previousActivity.startTime. I'm getting an error with this code:

nstimeinterval *previousActivityDuration = [previousActivity.stopTime timeIntervalSinceDate:previousActivity.startTime];

Here's the error message:

"Initializing 'NSTimeInterval *' (aka 'double *') with an expression of incompatible type 'nstimeinterval' (aka 'double')"

I don't get it; If nstimeinterval is aka 'double', how is the initialization expression incompatible, and how do I fix it?

Many thanks!

Edit:

Per @Rmaddy's comment, I removed the asterisk. Then I get this error in the line immediately following:

Assigning to 'NSNumber *' from incompatible type 'nstimeinterval' (aka 'double')

Here's the offending line:

previousActivity.duration = previousActivityDuration;

我想nsdates之间的时间间隔，即previousActivity.stopTime和previousActivity.startTime，。我对这个代码出错：

nstimeinterval *previousActivityDuration = [previousActivity.stopTime timeIntervalSinceDate:previousActivity.startTime];

这里的错误消息：

"Initializing 'NSTimeInterval *' (aka 'double *') with an expression of incompatible type 'nstimeinterval' (aka 'double')"

我没有得到它；如果nstimeinterval即'双'，初始化表达式的不协调是如何，我怎么解决它？

谢谢！

编辑

rmaddy每”的评论，我删除了星号。然后我得到这个错误就跟线：

Assigning to 'NSNumber *' from incompatible type 'nstimeinterval' (aka 'double')

这里的犯规线：

previousActivity.duration = previousActivityDuration;

以上就是关于nstimeinterval的全部内容，相信你一定会非常满意。

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